In animals with a closed circulatory system, gas exchange occurs across the thin walls of ________

A) arteries
B) arterioles
C) capillaries
D) venules


C

Biology & Microbiology

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In some studies that use observational rather than experimental data, investigators develop ____, which conceptually

predict what they would see if a particular factor had no effect.

a. control treatments b. null models c. experimental controls d. null treatments e. experimental models

Biology & Microbiology

Answer the following statements true (T) or false (F)

1. Thomas Hunt Morgan was the genetics researcher who discovered X-linked inheritance patterns by studying fruit flies. 2. Linkage maps are diagrams of nitrogen base sequences on DNA. 3. X-linked recessive disorders affect more females than males. 4. A male expresses an X-linked recessive disorder only if he inherits alleles conferring the disorder from both parents. 5. Variants or alternate forms of a gene are called alleles.

Biology & Microbiology

A trait that increases the environmental fitness of an organism is called a ________.

A. adaptation B. hibernation C. migration D. extinction

Biology & Microbiology

The regulatory centers for the respiratory and circulatory systems are found in the _____

A) cerebrum B) cerebellum C) thalamus D) medulla oblongata

Biology & Microbiology